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Publish: 2021-05-24 05:10:16
1. Unknown_Error
2. This "gas ring" is called Prandtl Glauert condensation clouds, which is also known as "sonic boom clouds"
I have explained in detail the causes and formation conditions of this phenomenon before, This fog is called "sonic boom cloud". It is true that sonic boom clouds only appear when the object is in transonic motion (that is, from subsonic to supersonic). However, not all objects can appear sonic boom cloud in any case
before explaining that bullets have no sonic boom clouds, I'd like to explain the formation principle of sonic boom clouds: when the aircraft approaches the speed of sound, it will graally catch up with its own sound waves. At this time, because the fuselage can't compress the air quickly, it will graally accumulate on the windward side of the aircraft and its nearby area, and finally form a sudden change surface of physical properties such as pressure, temperature, velocity and density in the air shock wave surface (or shock wave). This shock surface is a highly concentrated surface of acoustic energy, so it is also called a cone
when the aircraft moves from subsonic to supersonic, the air pressure behind the shock surface drops sharply, resulting in a very low temperature, resulting in water vapor condensation, resulting in a cone-shaped cloud cluster with the aircraft as the central axis and spreading uniformly from the front of the wing, which is called Prandtl Glauert condensation clouds, That's what we know as "sonic boom cloud."
of course, most of the sonic boom clouds are formed just at the moment when they accelerate through the critical speed of the sound barrier, but under suitable conditions, aircraft close to the speed of sound can also proce sonic boom clouds< Therefore, the formation of sonic boom cloud requires
1: the speed is in the transonic stage
2: the environment with high air density, in other words, the lower the flight altitude, the better. This is helpful to increase the contrast of shock surface strength in pressure and temperature
3: moist air is more likely to form sonic boom clouds
this explains why sonic boom clouds mostly appear on fighter planes accelerating at low altitude on the sea< br />
--------------------------------------------------
I have explained in detail the causes and formation conditions of this phenomenon before, This fog is called "sonic boom cloud". It is true that sonic boom clouds only appear when the object is in transonic motion (that is, from subsonic to supersonic). However, not all objects can appear sonic boom cloud in any case
before explaining that bullets have no sonic boom clouds, I'd like to explain the formation principle of sonic boom clouds: when the aircraft approaches the speed of sound, it will graally catch up with its own sound waves. At this time, because the fuselage can't compress the air quickly, it will graally accumulate on the windward side of the aircraft and its nearby area, and finally form a sudden change surface of physical properties such as pressure, temperature, velocity and density in the air shock wave surface (or shock wave). This shock surface is a highly concentrated surface of acoustic energy, so it is also called a cone
when the aircraft moves from subsonic to supersonic, the air pressure behind the shock surface drops sharply, resulting in a very low temperature, resulting in water vapor condensation, resulting in a cone-shaped cloud cluster with the aircraft as the central axis and spreading uniformly from the front of the wing, which is called Prandtl Glauert condensation clouds, That's what we know as "sonic boom cloud."
of course, most of the sonic boom clouds are formed just at the moment when they accelerate through the critical speed of the sound barrier, but under suitable conditions, aircraft close to the speed of sound can also proce sonic boom clouds< Therefore, the formation of sonic boom cloud requires
1: the speed is in the transonic stage
2: the environment with high air density, in other words, the lower the flight altitude, the better. This is helpful to increase the contrast of shock surface strength in pressure and temperature
3: moist air is more likely to form sonic boom clouds
this explains why sonic boom clouds mostly appear on fighter planes accelerating at low altitude on the sea< br />
--------------------------------------------------
3. Sound barrier phenomenon
sound barrier is a physical phenomenon. When the speed of an object (usually an aircraft) approaches the speed of sound, it will graally catch up with its own sound wave. As a result of the superposition and accumulation of sound waves, the shock wave will be generated, which will cause obstacles to the acceleration of the aircraft. The obstacle to the acceleration caused by the sound speed is called the sound barrier. After breaking through the sound barrier and entering supersonic speed, a conical sound cone will be proced from the front end of the aircraft. The shock wave sounds like an explosion to the bystanders, so it is called sonic boom. The strong sonic boom will not only damage the ground buildings, but also damage the part of the aircraft extending beyond the impact surface
in addition, when the speed of the object is close to the speed of sound, the surrounding air is in a very high pressure state e to the superposition of sound waves, so once the object passes through the sound barrier, the surrounding pressure will drop sharply. In humid weather, sometimes the instantaneous low temperature caused by the sudden drop of pressure may make the temperature lower than its dew point temperature, making the water vapor condense into tiny droplets, which looks like a cloud to the naked eye. However, because the low pressure zone will return to normal pressure with the increase of the distance from the air to the fuselage, it looks like a cone-shaped cloud cluster with the object as the central axis and uniformly diffuses all around< In practice, it is found that when the flight speed reaches 9 / 10 of the speed of sound, that is, the Mach number is mo.9, and the air speed is about 950 km / h, the speed of local air flow may reach the speed of sound, resulting in local shock wave, which leads to a sharp increase in aerodynamic drag. To further improve the speed, the engine needs more thrust. What's more, the shock wave can make the air flow through the wing and fuselage surface become very disordered, which makes the aircraft shake violently and it is very difficult to control. At the same time, the wing will sink and the nose will fall; If the aircraft is climbing at this time, the fuselage will suddenly pitch up automatically. These annoying symptoms can lead to a plane crash. This is the so-called "sound barrier" problem. Because the transmission speed of sound wave is limited, the moving sound source can catch up with its own sound wave. When the speed of an object increases to the same speed of sound, sound waves begin to pile up in front of the object. If the object has enough acceleration, it can break through the unstable sound barrier and rush in front of the sound, that is, break through the sound barrier
an object moving at supersonic speed will continuously proce stable pressure waves (bow shock) in front of it. When the object moves towards the observer, the observer will not hear the sound; When an object passes through, the generated waves (Mach waves) come to the ground, and the pressure difference between the waves will form an audible effect, which is called sonic boom.
when the aircraft's flight speed is lower than the speed of sound, the air in contact with the aircraft is like a "communicator" to "inform" the air in front of the aircraft at the speed of transmitting sound, so that they "give way". However, when the speed of the aircraft exceeds the speed of sound, the air in front of the aircraft is compressed tightly because there is no time to avoid, and a thin wave surface shock wave is formed. Behind the shock wave, the air is compressed, which makes the pressure rise suddenly, prevents the further acceleration of the aircraft, and may cause the wing and tail to vibrate violently and explode
and the sound barrier is not only sound waves, but also resistance from the air. When the flying object is approaching Mach 1 (sound speed unit), the air coming from the front can not diffuse through the fuselage as usual, so the gas accumulates around the flying object, procing great pressure and causing an invisible air vortex, Commonly known as "death vortex", this is also known as the sound barrier. If the fuselage is not specially reinforced, it will be instantly shaken to pieces
explanation of sound barrier
when an object moves relative to a fluid, it will disturb the fluid
next, take the disturbance between aircraft and atmosphere as an example. After the disturbance is caused by aircraft, the disturbance will propagate to space in the form of wave. The ideal form is spherical wave. However, according to the principle of relative motion, the plane causes spherical wave 1 at location 1 at 1, then the plane moves forward at the speed of V, and the spherical wave diffuses at the speed of U. at 2, the plane causes spherical wave 2 at location 2, and their velocities remain unchanged. In this way, because the aircraft is always moving forward, the shape of the superposition of several waves will change
the above is the case of aircraft flying at a constant speed, which is more obvious if the aircraft accelerates. If the aircraft speed is not supersonic, i.e. V & lt; u. Then the wave is always in front of the plane. But when v = u, the plane and the wave begin to remain stationary. The plane continues to accelerate, V & gt; When u, the first disturbance wave will be superimposed with the later disturbance wave, and will always be near the front of the aircraft. This superposition wave is what we usually call a shock wave
approaching the sound barrier
at the end of the Second World War, the maximum speed of the fighter has exceeded 700 km / h. To further improve the speed, we will encounter the so-called "sound barrier" problem
the speed of sound propagation in the air is affected by the air temperature, and the value changes. When flying at different altitudes, the air temperature will change with altitude, so the speed of sound is also different. Under international standard atmospheric conditions, the speed of sound at sea level is 1227.6 km / h and 1065.6 km / h at an altitude of 11000 M. For an aircraft with a speed of more than 700 km / h, the local speed may be much higher than that of 700 km / h e to the different shapes of the air flow on the airframe surface. When the aircraft flies faster, the speed of local air flow may reach the speed of sound, and local shock wave will be generated, which will increase the aerodynamic drag sharply
this kind of "sound barrier" has puzzled the pilots of high-speed fighters. Whenever their plane approaches the speed of sound, there is a strange reaction in the control of the plane, and improper handling will destroy the plane and kill people. At the end of the Second World War, the British jet fighters and the American "thunder" fighters were the first to feel the compressibility effect of air when flying at high speed close to the speed of sound. In other words, in the front of the high-speed aircraft, e to the local shock wave, the air is compressed and the resistance increases sharply“ The speed of the "flamethrower" aircraft can reach 9 / 10 of the speed of sound when diving with maximum power. This speed is enough to make the plane feel the compression effect of air. In order to better express the degree of flight speed approaching or exceeding the local sound speed, scientists used an important parameter to reflect the flight speed: Mach number. It is the ratio of the speed of flight to the local speed of sound. The m-number is named after the Austrian physicist Yi mach. Mach had carried out supersonic experiments of bullets in the late 19th century, and the existence of Mach wave, which is the wave front proced by the disturbance source in supersonic airflow, was first discovered. If the M number is less than 1, it means that the flight speed is less than the speed of sound; M = 1, which means the flight speed is equal to the speed of sound; If M is greater than 1, it means that the flight speed is greater than the speed of sound, and it is supersonic
at the end of the Second World War, the speed of fighter lift aircraft reached 650-750 km / h, which was close to the limit of piston aircraft. For example, the p-5ld Mustang fighter of the United States has a maximum speed of 765 km / h, which is probably the fastest among the piston fighters propelled by propellers. In order to further improve the flight speed, the engine thrust must be increased, but the piston engine has been unable to do anything. Aviation scientists have realized that in order to impact the speed of sound, it is necessary to use a brand new aeroengine, namely jet engine< At the end of World War II, Germany successfully developed Me-163 and Me-262 new fighters and put them into front-line combat between the Soviet Union and Germany. These two kinds of jet fighters were never seen by ordinary people at that time, with swept wing. The former is equipped with a liquid fuel rocket engine with a speed of 933 km / h; The latter is equipped with two turbojet engines with a maximum speed of 870 km / h. It is the first combat jet fighter in the world. Although their speed was significantly higher than that of their rivals' piston fighters, their participation in the war, e to their small number and inflexibility, did not actually play a role in saving the fate of fascist Germany's failure
the emergence of German jets prompted the former anti fascist countries to speed up the development of their own jet fighters. Britain's "meteor" fighters soon flew into the blue sky, and the famous Soviet aircraft design bureaus, such as Michael young, lavorkin, Sukhoi and Yakovlev, began to develop aircraft that could compete with the new German fighters one after another
MIG Design Bureau has developed the yi-250 experimental high-speed fighter (MIG-13), which is composed of a piston engine and a ramjet engine with a hybrid power unit. At an altitude of 7000 meters, the engine proces a total power of 2800 horsepower, which can make the flight speed reach 825 km / h. On March 3, 1945, test pilot jayev completed his first flight with the i-250. Among the Soviet fighter planes, the i250 is the first one with a flight speed of 825 km / h. It was proced in small quantities
Sukhoi Design Bureau has developed the Su-5 experimental interceptor, which also uses the hybrid power unit. In April 1945, the speed of Su-5 reached 800 km / h. Su-7, another model, is equipped with liquid rocket accelerator (thrust 300 kg) in addition to piston engine, which can increase flight speed in a short time. The fighters designed by lavocchigin and Yakovlev are also equipped with liquid rocket accelerators. However, the method of using liquid rocket accelerator to increase flight speed is not reliable. Its fuel and oxidant are only enough for a few minutes; Moreover, the corrosive nitric acid oxidant is very troublesome to use, and even the engine explosion accident may occur. Test pilot rastorguev died in a rocket booster accelerator explosion. In this case, the Soviet aviation instry suspended the use of liquid rocket accelerators on airplanes and made every effort to develop turbojet engines
the successful development of turbojet engine breaks through the limitation of piston engine and propeller to aircraft speed. However, despite the new power plant, there are many obstacles on the way to the speed of sound. At that time, it was found in practice that when the flight speed reached nine tenths of the speed of sound, that is, the Mach number mo.9, and the air speed was about 950 km / h, the local shock wave would make the resistance increase rapidly. To further improve the speed, the engine needs more thrust. What's more, the shock wave can make the air flow through the wing and fuselage surface become very disordered, which makes the aircraft shake violently and it is very difficult to control. At the same time, the wing will sink and the nose will fall; If the aircraft is climbing at this time, the fuselage will suddenly pitch up automatically. These annoying symptoms can lead to a plane crash
aerodynamic scientists work closely with aircraft designers. A series of flight tests have been carried out. The results show that in order to further increase the flight speed, the aircraft must adopt a new aerodynamic shape, for example, the swept wing should be thinned. Development of the central Zhukovsky Institute of fluid dynamics in the former Soviet Union
sound barrier is a physical phenomenon. When the speed of an object (usually an aircraft) approaches the speed of sound, it will graally catch up with its own sound wave. As a result of the superposition and accumulation of sound waves, the shock wave will be generated, which will cause obstacles to the acceleration of the aircraft. The obstacle to the acceleration caused by the sound speed is called the sound barrier. After breaking through the sound barrier and entering supersonic speed, a conical sound cone will be proced from the front end of the aircraft. The shock wave sounds like an explosion to the bystanders, so it is called sonic boom. The strong sonic boom will not only damage the ground buildings, but also damage the part of the aircraft extending beyond the impact surface
in addition, when the speed of the object is close to the speed of sound, the surrounding air is in a very high pressure state e to the superposition of sound waves, so once the object passes through the sound barrier, the surrounding pressure will drop sharply. In humid weather, sometimes the instantaneous low temperature caused by the sudden drop of pressure may make the temperature lower than its dew point temperature, making the water vapor condense into tiny droplets, which looks like a cloud to the naked eye. However, because the low pressure zone will return to normal pressure with the increase of the distance from the air to the fuselage, it looks like a cone-shaped cloud cluster with the object as the central axis and uniformly diffuses all around< In practice, it is found that when the flight speed reaches 9 / 10 of the speed of sound, that is, the Mach number is mo.9, and the air speed is about 950 km / h, the speed of local air flow may reach the speed of sound, resulting in local shock wave, which leads to a sharp increase in aerodynamic drag. To further improve the speed, the engine needs more thrust. What's more, the shock wave can make the air flow through the wing and fuselage surface become very disordered, which makes the aircraft shake violently and it is very difficult to control. At the same time, the wing will sink and the nose will fall; If the aircraft is climbing at this time, the fuselage will suddenly pitch up automatically. These annoying symptoms can lead to a plane crash. This is the so-called "sound barrier" problem. Because the transmission speed of sound wave is limited, the moving sound source can catch up with its own sound wave. When the speed of an object increases to the same speed of sound, sound waves begin to pile up in front of the object. If the object has enough acceleration, it can break through the unstable sound barrier and rush in front of the sound, that is, break through the sound barrier
an object moving at supersonic speed will continuously proce stable pressure waves (bow shock) in front of it. When the object moves towards the observer, the observer will not hear the sound; When an object passes through, the generated waves (Mach waves) come to the ground, and the pressure difference between the waves will form an audible effect, which is called sonic boom.
when the aircraft's flight speed is lower than the speed of sound, the air in contact with the aircraft is like a "communicator" to "inform" the air in front of the aircraft at the speed of transmitting sound, so that they "give way". However, when the speed of the aircraft exceeds the speed of sound, the air in front of the aircraft is compressed tightly because there is no time to avoid, and a thin wave surface shock wave is formed. Behind the shock wave, the air is compressed, which makes the pressure rise suddenly, prevents the further acceleration of the aircraft, and may cause the wing and tail to vibrate violently and explode
and the sound barrier is not only sound waves, but also resistance from the air. When the flying object is approaching Mach 1 (sound speed unit), the air coming from the front can not diffuse through the fuselage as usual, so the gas accumulates around the flying object, procing great pressure and causing an invisible air vortex, Commonly known as "death vortex", this is also known as the sound barrier. If the fuselage is not specially reinforced, it will be instantly shaken to pieces
explanation of sound barrier
when an object moves relative to a fluid, it will disturb the fluid
next, take the disturbance between aircraft and atmosphere as an example. After the disturbance is caused by aircraft, the disturbance will propagate to space in the form of wave. The ideal form is spherical wave. However, according to the principle of relative motion, the plane causes spherical wave 1 at location 1 at 1, then the plane moves forward at the speed of V, and the spherical wave diffuses at the speed of U. at 2, the plane causes spherical wave 2 at location 2, and their velocities remain unchanged. In this way, because the aircraft is always moving forward, the shape of the superposition of several waves will change
the above is the case of aircraft flying at a constant speed, which is more obvious if the aircraft accelerates. If the aircraft speed is not supersonic, i.e. V & lt; u. Then the wave is always in front of the plane. But when v = u, the plane and the wave begin to remain stationary. The plane continues to accelerate, V & gt; When u, the first disturbance wave will be superimposed with the later disturbance wave, and will always be near the front of the aircraft. This superposition wave is what we usually call a shock wave
approaching the sound barrier
at the end of the Second World War, the maximum speed of the fighter has exceeded 700 km / h. To further improve the speed, we will encounter the so-called "sound barrier" problem
the speed of sound propagation in the air is affected by the air temperature, and the value changes. When flying at different altitudes, the air temperature will change with altitude, so the speed of sound is also different. Under international standard atmospheric conditions, the speed of sound at sea level is 1227.6 km / h and 1065.6 km / h at an altitude of 11000 M. For an aircraft with a speed of more than 700 km / h, the local speed may be much higher than that of 700 km / h e to the different shapes of the air flow on the airframe surface. When the aircraft flies faster, the speed of local air flow may reach the speed of sound, and local shock wave will be generated, which will increase the aerodynamic drag sharply
this kind of "sound barrier" has puzzled the pilots of high-speed fighters. Whenever their plane approaches the speed of sound, there is a strange reaction in the control of the plane, and improper handling will destroy the plane and kill people. At the end of the Second World War, the British jet fighters and the American "thunder" fighters were the first to feel the compressibility effect of air when flying at high speed close to the speed of sound. In other words, in the front of the high-speed aircraft, e to the local shock wave, the air is compressed and the resistance increases sharply“ The speed of the "flamethrower" aircraft can reach 9 / 10 of the speed of sound when diving with maximum power. This speed is enough to make the plane feel the compression effect of air. In order to better express the degree of flight speed approaching or exceeding the local sound speed, scientists used an important parameter to reflect the flight speed: Mach number. It is the ratio of the speed of flight to the local speed of sound. The m-number is named after the Austrian physicist Yi mach. Mach had carried out supersonic experiments of bullets in the late 19th century, and the existence of Mach wave, which is the wave front proced by the disturbance source in supersonic airflow, was first discovered. If the M number is less than 1, it means that the flight speed is less than the speed of sound; M = 1, which means the flight speed is equal to the speed of sound; If M is greater than 1, it means that the flight speed is greater than the speed of sound, and it is supersonic
at the end of the Second World War, the speed of fighter lift aircraft reached 650-750 km / h, which was close to the limit of piston aircraft. For example, the p-5ld Mustang fighter of the United States has a maximum speed of 765 km / h, which is probably the fastest among the piston fighters propelled by propellers. In order to further improve the flight speed, the engine thrust must be increased, but the piston engine has been unable to do anything. Aviation scientists have realized that in order to impact the speed of sound, it is necessary to use a brand new aeroengine, namely jet engine< At the end of World War II, Germany successfully developed Me-163 and Me-262 new fighters and put them into front-line combat between the Soviet Union and Germany. These two kinds of jet fighters were never seen by ordinary people at that time, with swept wing. The former is equipped with a liquid fuel rocket engine with a speed of 933 km / h; The latter is equipped with two turbojet engines with a maximum speed of 870 km / h. It is the first combat jet fighter in the world. Although their speed was significantly higher than that of their rivals' piston fighters, their participation in the war, e to their small number and inflexibility, did not actually play a role in saving the fate of fascist Germany's failure
the emergence of German jets prompted the former anti fascist countries to speed up the development of their own jet fighters. Britain's "meteor" fighters soon flew into the blue sky, and the famous Soviet aircraft design bureaus, such as Michael young, lavorkin, Sukhoi and Yakovlev, began to develop aircraft that could compete with the new German fighters one after another
MIG Design Bureau has developed the yi-250 experimental high-speed fighter (MIG-13), which is composed of a piston engine and a ramjet engine with a hybrid power unit. At an altitude of 7000 meters, the engine proces a total power of 2800 horsepower, which can make the flight speed reach 825 km / h. On March 3, 1945, test pilot jayev completed his first flight with the i-250. Among the Soviet fighter planes, the i250 is the first one with a flight speed of 825 km / h. It was proced in small quantities
Sukhoi Design Bureau has developed the Su-5 experimental interceptor, which also uses the hybrid power unit. In April 1945, the speed of Su-5 reached 800 km / h. Su-7, another model, is equipped with liquid rocket accelerator (thrust 300 kg) in addition to piston engine, which can increase flight speed in a short time. The fighters designed by lavocchigin and Yakovlev are also equipped with liquid rocket accelerators. However, the method of using liquid rocket accelerator to increase flight speed is not reliable. Its fuel and oxidant are only enough for a few minutes; Moreover, the corrosive nitric acid oxidant is very troublesome to use, and even the engine explosion accident may occur. Test pilot rastorguev died in a rocket booster accelerator explosion. In this case, the Soviet aviation instry suspended the use of liquid rocket accelerators on airplanes and made every effort to develop turbojet engines
the successful development of turbojet engine breaks through the limitation of piston engine and propeller to aircraft speed. However, despite the new power plant, there are many obstacles on the way to the speed of sound. At that time, it was found in practice that when the flight speed reached nine tenths of the speed of sound, that is, the Mach number mo.9, and the air speed was about 950 km / h, the local shock wave would make the resistance increase rapidly. To further improve the speed, the engine needs more thrust. What's more, the shock wave can make the air flow through the wing and fuselage surface become very disordered, which makes the aircraft shake violently and it is very difficult to control. At the same time, the wing will sink and the nose will fall; If the aircraft is climbing at this time, the fuselage will suddenly pitch up automatically. These annoying symptoms can lead to a plane crash
aerodynamic scientists work closely with aircraft designers. A series of flight tests have been carried out. The results show that in order to further increase the flight speed, the aircraft must adopt a new aerodynamic shape, for example, the swept wing should be thinned. Development of the central Zhukovsky Institute of fluid dynamics in the former Soviet Union
4. 2006-4-17 12:14:49 read 1036 times
Shangrao City governs 10 counties including Shangrao, Guangfeng, Yushan, Wuyuan, Yiyang, Hengfeng, Boyang, Yugan, Wannian and Xinzhou District, and takes charge of Dexing City. It covers an area of 22791 square kilometers. The population is 6.6 million<
Shangrao city is located in the northeast of Jiangxi Province. It is adjacent to Zhejiang in the East, Anhui in the West and Fujian in the south; It is known as "the thoroughfare of eight provinces" and "the first gateway of Yuzhang". Zhejiang Jiangxi railway passes through the territory, Anhui Jiangxi railway and Hengnan railway crisscross; National highways 320, 206 and 311 run through the East, West, North and south, and there are four airports within 100 miles. Transportation and communication are extremely convenient<
Shangrao is located in subtropical humid climate zone, with annual average temperature of 16.7 ~ 18.2 ℃ and annual precipitation of 1600 ~ 1800 mm. The average frost free period is 244 days
Shangrao landform is dominated by medium and low mountains and hills. At the junction of Fujian and the south, there are Wuyishan mountains. The main peak of Huanggang mountain is 2157.7 meters above sea level, which is the highest peak in East China. The central huaiyushan mountains, the main peak of Yujing peak, 1816.9 meters above sea level, is the center of Sanqing mountain, a famous scenic spot in China. In the northern part of Jiangxi Anhui border, Zhanggong mountain and Huangshan Mountain are mostly low mountains and hills. There are contiguous small basins between them. The Poyang Lake Plain is famous for its rivers, lakes and fertile land<
Shangrao has four distinct seasons and beautiful scenery. Sanqing mountain in the middle of China is 200 Li in radius, magnificent and magnificent. It is known as "the first fairy peak in the south of the Yangtze River"
there are thirty-six peaks in the south of Guifeng, which are all scenic. Xu Xiake, a great traveler in Ming Dynasty, praised it as "the turtle peak on the river is rare in the world", and also praised it as "the bonsai in the world" by tourists
Wuyuan, with well preserved natural vegetation, a large number of ancient trees, ancient caves, ancient buildings and ancient relics, is known as "the most beautiful rural area in China" and the only cultural tourism demonstration county in southern China for its green mountains, green water, small bridges and flowing water, and peaceful pastoral scenery
and the waves of Poyang Lake; The Taoist incense of Gexian mountain; Yuanyang Lake's water playing mandarin cks; All of them are beautiful, which makes people admire the uncanny craftsmanship of creation and their preference for this land.
Shangrao City governs 10 counties including Shangrao, Guangfeng, Yushan, Wuyuan, Yiyang, Hengfeng, Boyang, Yugan, Wannian and Xinzhou District, and takes charge of Dexing City. It covers an area of 22791 square kilometers. The population is 6.6 million<
Shangrao city is located in the northeast of Jiangxi Province. It is adjacent to Zhejiang in the East, Anhui in the West and Fujian in the south; It is known as "the thoroughfare of eight provinces" and "the first gateway of Yuzhang". Zhejiang Jiangxi railway passes through the territory, Anhui Jiangxi railway and Hengnan railway crisscross; National highways 320, 206 and 311 run through the East, West, North and south, and there are four airports within 100 miles. Transportation and communication are extremely convenient<
Shangrao is located in subtropical humid climate zone, with annual average temperature of 16.7 ~ 18.2 ℃ and annual precipitation of 1600 ~ 1800 mm. The average frost free period is 244 days
Shangrao landform is dominated by medium and low mountains and hills. At the junction of Fujian and the south, there are Wuyishan mountains. The main peak of Huanggang mountain is 2157.7 meters above sea level, which is the highest peak in East China. The central huaiyushan mountains, the main peak of Yujing peak, 1816.9 meters above sea level, is the center of Sanqing mountain, a famous scenic spot in China. In the northern part of Jiangxi Anhui border, Zhanggong mountain and Huangshan Mountain are mostly low mountains and hills. There are contiguous small basins between them. The Poyang Lake Plain is famous for its rivers, lakes and fertile land<
Shangrao has four distinct seasons and beautiful scenery. Sanqing mountain in the middle of China is 200 Li in radius, magnificent and magnificent. It is known as "the first fairy peak in the south of the Yangtze River"
there are thirty-six peaks in the south of Guifeng, which are all scenic. Xu Xiake, a great traveler in Ming Dynasty, praised it as "the turtle peak on the river is rare in the world", and also praised it as "the bonsai in the world" by tourists
Wuyuan, with well preserved natural vegetation, a large number of ancient trees, ancient caves, ancient buildings and ancient relics, is known as "the most beautiful rural area in China" and the only cultural tourism demonstration county in southern China for its green mountains, green water, small bridges and flowing water, and peaceful pastoral scenery
and the waves of Poyang Lake; The Taoist incense of Gexian mountain; Yuanyang Lake's water playing mandarin cks; All of them are beautiful, which makes people admire the uncanny craftsmanship of creation and their preference for this land.
5. Fire coin Pro has won tens of millions of investments such as Zhenge fund and Sequoia Capital
6. The earliest investment was "paipai loan" in 2012. After that, they also invested in "snowball", "rong360" and "kaniu". In June 2014, the latest investment was in welab, a P2P financial platform in Hong Kong, with an investment of US $14 million, about RMB 100 million.
7. If the money you invested in Sequoia Capital requires you to pay the membership fee to withdraw cash, it is likely to be fraud. Please be alert to prevent being cheated. If there is any capital loss, you are advised to report it in time
warm tips:
1. The above information is for reference only
2. There are risks in investment, so we should choose carefully
response time: April 20, 2021. Please refer to the official website of Ping An Bank for the latest business changes
[Ping An Bank I know] want to know more? Come and see "Ping An Bank I know" ~
https://b.pingan.com.cn/paim/iknow/index.html
warm tips:
1. The above information is for reference only
2. There are risks in investment, so we should choose carefully
response time: April 20, 2021. Please refer to the official website of Ping An Bank for the latest business changes
[Ping An Bank I know] want to know more? Come and see "Ping An Bank I know" ~
https://b.pingan.com.cn/paim/iknow/index.html
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